Factual error: Rescuer and US Marine Jason Thomas is an African-American in real life, but was portrayed in the film as a white man. The film's producers realized the mistake only after production began, and apologized to Thomas, whose identity had not been widely known for years after September 11th.
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Revealing mistake: There is a scene just after when John is finally taken out of the rubble and you see the New York skyline with all the smoke in the distance. If you look closely you can see the smoke moving but the water of the river is completely stationary, indicating a still shot.
Factual error: At the end of the movie, in the hospital we see a Sierra Mist can where the other families are waiting. It is true that Sierra Mist was brought out on the market in 2000, however the can has the label of a recent Sierra Mist logo from 2003-2005. The logo used in the 2000-2002 time frame is much different looking.
Factual error: In the opening sequence of World Trade Center when the police men are beginning to patrol the streets the camera pans around a New York City street and a Charles Schwab ad can be seen with the "Talk to Chuck" slogan. The "Talk to Chuck" campaign was not introduced until September 2005.
Factual error: In the scene where the dead police officer's pistol starts going off, the gun would not have been able to fire more than once. Recoil operated guns can't function without a certain amount of resistance being applied to the grip. After the first round went off the slide wouldn't have been sent rearward, and the gun would have simply jammed.
Continuity mistake: Near the start of the movie when the office worker/security guard feel the 1st plane hit, the security guard is standing just behind the office worker's left shoulder. When the camera cuts to a side view the security guard is standing slightly in front of the office worker with his hand on the water cooler.